Neiko 03048A O2 Oxygen Sensor Wrench with Contour Handle and Flexible Head, Chrome-Vanadium Steel | 7/8" Designed quickly to remove and exchange difficult O2 sensors that use a 7/8 (22 mm) hex Unique contour handle and swivel head works around the exhaust and gets to places ordinary wrenches won't Ideal for domestic vehicle brands and compatible with Ford Contours, 4.6L and 5.4L Ford modular engines Made of the highest quality chrome vanadium steel to last job after job Designed to work on and 7/8" and 22mm knock sensors used on most mid-sized trucks, SUVs and vans